Declare custom javadoc tags
Declare custom javadoc tags

Declaring javadoc tags in the configuration for maven-javadoc-plugin
resolves several build warnings that appeared when using the
sonatype-oss-release profile.

Change-Id: I1be6950dd43fe844107a7f23381f5d7b20fe2935

OCselected/clouddocs-maven-plugin,rackerlabs/clouddocs-maven-plugin,stackforge/clouddocs-maven-plugin,rackerlabs/rackspace-docs-maven-plugin,rackerlabs/clouddocs-maven-plugin,rackerlabs/rackspace-docs-maven-plugin,stackforge/clouddocs-maven-plugin,OCselected/clouddocs-maven-plugin,OCselected/clouddocs-maven-plugin,stackforge/clouddocs-maven-plugin,rackerlabs/rackspace-docs-maven-plugin,rackerlabs/clouddocs-maven-plugin,stackforge/clouddocs-maven-plugin,rackerlabs/rackspace-docs-maven-plugin,OCselected/clouddocs-maven-plugin